build_dir?=build
src_dir?=src
tst_dir?=tst
install_dir?=install

# Comment out the bins that doesn't need to be compiled
bins+=01-main
bins+=02-switch
bins+=03-equity
bins+=11-join
bins+=12-join-main
bins+=21-create-many
bins+=22-create-many-recursive
bins+=23-create-many-once
bins+=31-switch-many
bins+=32-switch-many-join
bins+=33-switch-many-cascade
bins+=51-fibonacci
bins+=61-mutex
bins+=62-mutex
bins+=71-preemption
bins+=81-deadlock

bins_target=$(addprefix ${build_dir}/,${bins})
install_bins_targets=$(addprefix ${install_dir}/bin/,${bins})

valgrind_targets=$(addprefix valgrind_,${bins})

src_dirs=$(sort $(dir $(wildcard ${src_dir}/**/)))
includes=$(patsubst %,-I%,${src_dirs})

CFLAGS+=-g -O0 -std=c99 ${includes}
LDFLAGS+=
ifdef _USE_PTHREAD
LDFLAGS+=-lpthread
endif

# Tests if the last compilation was with pthread
ifeq ("$(wildcard .lastpthread)","")
	all_targets:=build
	pthread_targets:=clean build
else
	pthread_targets:=build
	all_targets:=clean build
endif

srcs+=$(wildcard ${src_dir}/*.c ${src_dir}/**/*.c)
objs+=$(patsubst %.c,${build_dir}/%.o,${srcs})

.PHONY: all
all: ${all_targets}
	${RM} .lastpthread  # Set that the last build was without pthread

.PHONY: install
install: build ${install_bins_targets}

${install_bins_targets}: ${install_dir}/bin/%: ${build_dir}/%
	@mkdir -p $(dir $@)
	install $^ $@

.PHONY: graphs
graphs:
	true

.PHONY: valgrind
valgrind: ${valgrind_targets}

.PHONY: ${valgrind_targets}
${valgrind_targets}: valgrind_%: ${build_dir}/%
	valgrind $^ --leak-check=full --show-reachable=yes --track-origins=yes

.PHONY: build
build: ${bins_target}

.PHONY: pthreads
pthreads:
	$(MAKE) _USE_PTHREAD=. ${pthread_targets}
	touch .lastpthread

.PHONY: check
check:
	true

${bins_target}: ${build_dir}/%: ${objs} ${build_dir}/${tst_dir}/%.o
	${CC} -o $@ $^ ${CFLAGS} ${LDFLAGS}

${build_dir}/%.o: %.c
	@mkdir -p $(dir $@)
	${CC} -o $@ -c $^ ${CFLAGS}

.PHONY: compile_flags.txt
compile_flags.txt:
	(echo "${CFLAGS} ${LDFLAGS}" | sed 's/ /\n/g') > compile_flags.txt

.PHONY: clean
clean:
	${RM} -r build